Call the operator (100) ask for the Guardroom at Chivenor. Speak to the Duty Sapper bloke ask him to give you the training wing number for 24 Regt. Call Training wing straight after you bone idle ****. Job jobbed, get on it or get fecked.
edit: Best call the training wing during working hours. 09:00-1000
Next beat up is April. I forget the exact date, but like SKJOLD said, give the guard room a bell. They also have a "look at us" weekend in January which you should get on, they take you through the bottom field and the RMBFT at 6 in the morning, good fun.